Selector



J. A. HALL.

SELECTOR.

APPLICATION FILED SEPT. 19, I919.

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JOHN A. HALL, OF BAYSIDE, NEW YORK, ASSIGNOR T0 WESTERN ELECTRIC GOM-PMQ'Y, INCORPORATED, OF NEW YORK, N. Y., A COE?ORATION OF NEW YURK.

SELECTOR.

Specification of Letters Patent.

Patented Apr. 12, 1921.

Application filed September 19, 1919. Serial No. 324,918.

To all whom it may concern Be it known that 1, JOHN A. HALL, a citizenof the United States, residing at Bayside, Long Island, in the county ofQueens, State of New York, have invented certain new and usefulImprovements in Selectors, of which the following is a full, clear,concise, and exact description.

This invention relates to electrical selectors or impulse respondersconsisting of relays which are energized in succession to select acertain circuit.

The object of the invention is to improve the arrangements of this kindpreviously used, such, for instance, as that shown in Patent No.1,279,811 of September 24, 1918, to S. B. illiams, Jr.

In accordance with this invention a previously energized selecting relayis deenergized upon the beginning rather than the end of the impulse forenergizing the nest relay whereby an economy in current consumption isefiected.

The accompanying drawing shows diagrammatically an embodiment of theinven tion.

The selectable circuits numbered 30, 37, 38 and 39, and here shown assingle wire circuits, are connected to front contacts of switchingrelays 10, 17, 18 and 19 respectively. A selector of this kind might,with slight modifications, be adapted for use in a telephone system suchas disclosed in United States Patent No. 1,262,? 52 to H. P. Clausen,the switching relays replacing the keys shown therein, thus permittingof the use of an ordinary subscribers station and calling dial andresulting in a considerable saving in the cost and labor of wiring andcabling since the switching relays could be placed at a central point.The selector normally consists of twenty switching relays, only eightbeing shown, arranged in pairs, each pair including what may be calledan impulse relay and a holding relay. It is obvious, however, that anynumber might be used, that being limited only by the number of impulsesthat could be sent.

A Stepping relay 6 is bridged across a pair of conductors leading to asubscribers station A having an impulse sender 1 located thereat. Uponenerglzation of stepping relay 6, a slow acting relay 7 is energizedwhich completes the impulse circuit to the selector over the conductor 5and the holding circuit over the conductor 4. Relay 7, beingslow-to-release, does not release its armatures during the sending ofimpulses.

in considering the operation of the system, suppose it is desired toselect the second circuit numbered 38 on the accompanying drawing. Uponremoval of the receiver at the substation A from the switchhook, theloop to relay 6 is closed and relay 6 is energized. Upon energization ofrelay 6, its armature is attracted and a circuit is formed forslow-acting relay 7 over ground, armature and front contact of relay 6,winding of relay 7 to grounded battery. Relay 7 upon energization,attracts its armatures, thus closing its contacts to which the impulseconductor 5 and holding conductor 1 are connected. The impulse sender isthen operated to send the number of impulses corresponding to'thecircuit desired.

Upon the first interruption of the line circuit, the armature of relay 6drops back and a circuit is completed from ground, armature and backcontact of relay 6, inner armature and front contact of relay 7, impulseconductor 5, normal contacts of inner left armatures of relays 10, 17and 18, back contact and armature of relay 20, winding of impulse relay19 to grounded battery. Relay 19 attracts its armature and prepares acircuit for the energization of relay 20 over ground, outer armature andfront contact of relay 7, holding conductor 4, outer left-hand armatureand back contact of relay 18, front contact and inner armature of relay19, winding of relay 20, winding of relay 19 to grounded battery. Relay20 is, however, shunted through its armature and normal contact toground at the armature and back contact of the stepping relay 6, at thismoment. I

Upon the subsequent closing of the line circuit, relay 6 is againenergized and relay 20 is. therefore, energized in series with relay 19over the circuit above traced, and through the movement of itsarmature,prepares a circuit for the energization of impulse relay 18.

Upon the next interruption of the line circuit, the armature of relay (3again drops back and another impulse is transmitted over conductor 5,the circuit being established from ground, armature and back contact ofrelay 6, inner armature and front contact of relay 7, impulse conductor5, normal contacts of the inner left-hand armatures of relays 10, 17 and18, armature and front contact of relay 20, armature and back contact ofrelay 21 and winding of impulse relay 18 to grounded battery. Relay 18is energized and immediately through the normal contact of its innerleft'hand armature breaks the circuit just described and substitutestherefor. a circuit through the alternate contact of its inner left-handarmature, armature and back contact of relay 21 and winding of relay 18to grounded battery. Thecontacts at the inner left-hand armature are ofthe mak'e-betore-break type. Relay 18 in attracting its armatures breaksthe holding circuit for relays 19 and 20. Relay 18, upon energization,prepares a circuit for holding relay 21 over the following path:grounded battery, winding of relay 18, winding of relay 21, innerright-hand armature and front contact of relay 18, back contact andouter left-hand armature of relay 17, conductor 4, front contact andouter armature of relay 7 to ground. Relay 21 is, however, shuntedthrough its armature and normal contact to ground at the stepping relayat this moment. Upon the cessation of the second impulse over theimpulse circuit, relay 6 is again energized and relay 21 is energizedover the circuit above traced and through the movement of its armatureprepares the circuit for the energiza-tion of the next impulse relay 17At the beginning of the second impulse over the impulse .circuit, relay18 was energized and closed a circuit at its outer righthand armatureand front contact from ground to the desired circuit 38. Over theholding conductor 4 relays 21 and 18 are held energized and theconnection to the selected circuit 38 is maintained until the subscriberat sub-station A replaces the receiver on the hook which interrupts theline circuit, thus deenergizing relay 6. Deenergization of relay 6 opensthe circuit to relay 7, whichdeenergizes. thus releasing its armaturesand opening the holding circuit leading to the selector. \Vhen theholding circuit is opened, relays 21 and 18 deenergize, the connectionto the selected circuit 38 is opened and the selector is again ready foruse.

What is claimed is:

1. A selector comprising a series of switch-- energizing av previouslyenergized relay upon the beginning of the impulse tor energizing thenext one of said relays.

2. A selector comprising a series of switching relays, a plurality ofselective lines controlled by said relays, an impulse circuit forenergizing the relays in succession, means whereby each relay afterhaving been operated is deenergized on the beginning of the impulseenergizing the next relay, and a holding circuit operable after theselector has been set to a fixed selective position.

3. A selector comprising a series of switching relays, a plurality ofselective lines controlled by said relays, an impulse circuit forenergizing the relays in succession, means whereby each relay afterhaving been operated is deenergized on the beginning of the impulseenergizing the next relay, a holding circuit operable after the selectorhas been set to a fixed selective position, and means for restoring saidselector to normal position.

4. A selector comprising a series of pairs of switching relays, eachpair including an impulse relay, an impulse circuit for energizing theimpulse relays in succession, and means for de'c'nergizing a previouslyenergized impulse relay on the beginning of the impulse energizing thenext impulse relay.

5. A selector comprising a series of switching relays arranged in pairs,each pair including an impulse relay and a holding relay, an impulsecircuit for energizing the impulse relays in succession, a holdingcircuit for energizing the holding relays in succession, and means fordeenergizing a previously energized impulse relay on the beginning ofthe impulse energizing the next impulse relay.

6. A selector comprising a series of switching relays arranged in pairs,each pair in cluding an impulse relay, a plurality of selective linescontrolled by said impulse relays, an impulse circuit for energizing theimpulse relays in succession, means whereby each impulse relay afterhaving been operated is denergized on the beginning of the impulseenergizing the next impulse relay, and a holding circuit operable afterthe selector has been set to a fixed selective position.

In witness whereof, I hereunto subscribe my name this 12th day ofSeptember A. D., 1919.

JOHN A. HALL.

